Mercurial > hg
view tests/test-convert-bzr-114.t @ 39560:84bf6ded9317
wireprotoframing: buffer emitted data to reduce frame count
An upcoming commit introduces a wire protocol command that can emit
hundreds of thousands of small objects. Without a buffering layer,
we would emit a single, small frame for every object. Performance
profiling revealed this to be a source of significant overhead for
both client and server.
This commit introduces a very crude buffering layer so that we emit
fewer, bigger frames in such a scenario. This code will likely get
rewritten in the future to be part of the streams API, as we'll
need a similar strategy for compressing data. I don't want to think
about it too much at the moment though.
server
before: user 32.500+0.000 sys 1.160+0.000
after: user 20.230+0.010 sys 0.180+0.000
client
before: user 133.400+0.000 sys 93.120+0.000
after: user 68.370+0.000 sys 32.950+0.000
This appears to indicate we have significant overhead in the frame
processing code on both client and server. It might be worth profiling
that at some point...
Differential Revision: https://phab.mercurial-scm.org/D4473
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Wed, 29 Aug 2018 16:43:17 -0700 |
parents | 89872688893f |
children | 26127236b229 |
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#require bzr bzr114 $ . "$TESTDIR/bzr-definitions" The file/directory replacement can only be reproduced on bzr >= 1.4. Merge it back in test-convert-bzr-directories once this version becomes mainstream. replace file with dir $ mkdir test-replace-file-with-dir $ cd test-replace-file-with-dir $ bzr init -q source $ cd source $ echo d > d $ bzr add -q d $ bzr commit -q -m 'add d file' $ rm d $ mkdir d $ bzr add -q d $ bzr commit -q -m 'replace with d dir' $ echo a > d/a $ bzr add -q d/a $ bzr commit -q -m 'add d/a' $ cd .. $ hg convert source source-hg initializing destination source-hg repository scanning source... sorting... converting... 2 add d file 1 replace with d dir 0 add d/a $ manifest source-hg tip % manifest of tip 644 d/a $ cd source-hg $ hg update 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cd ../..